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协调器接收的数据量超过路由器发送的数据量



一个协调器和一个路由器,透明传输,路由器每隔200ms给协调器发送64字节数据,发送和接收都通过串口显示出来,实验发现,协调器接收的数据量大于发送的数据量,请问这是怎么回事?